import Vue from 'vue';
import Router from 'vue-router';
import routes from './routers';
import store from '@/store';
import iView from 'iview';
import { setToken, getToken, canTurnTo, setTitle } from '@/libs/util';
import config from '@/config';
const { homeName } = config;

Vue.use(Router);
const router = new Router({
  routes
  // mode: 'history'
});
const LOGIN_PAGE_NAME = 'login';

const turnTo = (to, access, next) => {
  if (canTurnTo(to.name, access, routes)) next(); // 有权限，可访问
  //  else next({ replace: true, name: 'error_401' }); // 无权限，重定向到401页面
};

router.beforeEach((to, from, next) => {
  iView.LoadingBar.start();
  const token = getToken();
  if (!token && to.name !== LOGIN_PAGE_NAME) {
    // 未登录且要跳转的页面不是登录页
    next({
      name: LOGIN_PAGE_NAME // 跳转到登录页
    });
  } else if (!token && to.name === LOGIN_PAGE_NAME) {
    // 未登陆且要跳转的页面是登录页
    next(); // 跳转
  } else if (token && to.name === LOGIN_PAGE_NAME) {
    // 已登录且要跳转的页面是登录页
    next({
      name: homeName // 跳转到homeName页
    });
  } else {
    // 已登录且跳转的不是登录页
    if (store.state.user.hasGetInfo) {
      // 如果没有菜单列表，那么先加载菜单列表，等加载成功再跳转。因为菜单获取是异步的，避免页面已经跳转，但尚未显示菜单的问题
      if (store.state.user.userMenu.length == 0) {
        store.dispatch('getUserMenuList').then(res => {
          turnTo(to, store.state.user.access, next);
        }).catch((err) => {
          console.log(err);
        });
      } else {
        turnTo(to, store.state.user.access, next);
      }
    } else {
      store.dispatch('getUserInfo').then(user => {
        // 拉取用户信息，通过用户权限和跳转的页面的name来判断是否有权限访问;access必须是一个数组，如：['super_admin'] ['super_admin', 'admin']
        // turnTo(to, user.access, next);
        if (store.state.user.userMenu.length == 0) {
          store.dispatch('getUserMenuList').then(res => {
            turnTo(to, store.state.user.access, next);
          }).catch((err) => {
            console.log(err);
          });
        } else {
          turnTo(to, store.state.user.access, next);
        }
      }).catch(() => {
        // 获取用户信息失败，到登录页
        setToken('');
        next({
          name: 'login'
        });
      });
    }
  }
});

router.afterEach(to => {
  setTitle(to, router.app);
  iView.LoadingBar.finish();
  window.scrollTo(0, 0);
});

export default router;
